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Verb: close off
  1. Stem the flow of
    "close off the gas when you leave for a vacation";
    - shut off
  2. Isolate or separate
    - shut off
  3. Block off the passage through
    "We close off the valve";
    - shut off, block off

Derived forms: closes off, closing off, closed off

Type of: bar, barricade, block, block off, block up, blockade, cease, discontinue, divide, give up, lay off, quit, separate, stop, surcease [archaic]